<div class="clock">
  <div class="flip">
    <div class="digital front" data-number="0"></div>
    <div class="digital back" data-number="1"></div>
  </div>
  <div class="flip">
    <div class="digital front" data-number="0"></div>
    <div class="digital back" data-number="1"></div>
  </div>
  <em class="divider">:</em>
  <div class="flip">
    <div class="digital front" data-number="0"></div>
    <div class="digital back" data-number="1"></div>
  </div>
  <div class="flip">
    <div class="digital front" data-number="0"></div>
    <div class="digital back" data-number="1"></div>
  </div>
  <em class="divider">:</em>
  <div class="flip">
    <div class="digital front" data-number="0"></div>
    <div class="digital back" data-number="1"></div>
  </div>
  <div class="flip">
    <div class="digital front" data-number="0"></div>
    <div class="digital back" data-number="1"></div>
  </div>
</div>
